If you mean the green square icon then that means that this program can only be manually deleted. The other icon is a orange circle with an exclamation point inside which means that this show can be deleted by the Gateway if there is no space left for a new show to be recorded on.

Oh - OK. . . . . . . so is this something I would have (unknowingly) set up when I originally set the program to record? (I did know about the yellow circle with exclamation mark and also the red circle etc. just didn't know what the green indicated) thank you.